The software of the Ford management can be re-written if you really want to. There's a lot of knowledge and groups about this in the net. But by no means am I saying that it''s the easiest way. Whatever you do, don't go to KE-jetronic. Keep the efi, just change the ecu to a something more mappable. If you're about to use tha standard pistons and C/R, don't have you're hopes too high as far as power is concerned. If you turbo an engine with cast pistons, you really should know what you are doing.